Fbx mapping channels export


I am currently getting into uv unwrapping in rhino and discovered, that the fbx export only exports the first mapping channel.

I tested the fbx in unity and blender to confirm this.

Here is a Rhino7 file for demonstration:
MultipleMappingChannels.3dm (831.6 KB)

I hope someone has a solution to exporting uv channels!

Thanks for any help in advance!